code: def test_stream_chunk_builder_litellm_function_call():
      try:
          litellm.set_verbose = False
          response = litellm.completion(
              model="gpt-3.5-turbo",
              messages=messages,
              functions=[function_schema],
              # stream=True,
              # complete_response=True # runs stream_chunk_builder under-the-hood
          )
  
          print(f"response: {response}")
      except Exception as e:
          pytest.fail(f"An exception occurred - {str(e)}")
  
file_path: litellm/litellm/tests/test_stream_chunk_builder.py
imports: import sys, os, time
  import traceback, asyncio
  import pytest
  from litellm import completion, stream_chunk_builder
  import litellm
  import os, dotenv
  from openai import OpenAI
  import pytest
label_desc: Use image node_id 1 for calling a global function with example usage: test_stream_chunk_builder_litellm_function_call() without return types